In article ,
"Tim+" writes:
We have a pressurised HW system (an Albion Ultrasteel cylinder) with a
external 18L expansion vessel.

For some time now we've suffered from intermittant dirty water supplies
which we suspect was due to a problem with our water mains further down the
street (as manifest by the major blowout recently
http://i1052.photobucket.com/albums/...k/da49f87f.jpg )

Reminds me of
http://news.nationalgeographic.com/n...world-science/

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]